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Draft CF 1.7 Data Model

Terms of Reference

Development

Ticket #107 is managing the discussion of the data model development. If any changes are made to this wiki please add a uri to the change set as a comment to #107 so that the changes can be observed and discussed.

UML Model

This is a draft of the data model in UML (which will change through the discussions of #107)

Types

Field

Dimension Coord

Auxiliary Coord

Derived Coord

Coordinate Reference System

Cell Method

Cell Measure

A cell measure construct provides information about the size of the cells defined by an ordered list of one or more domain axes of the field. Where provided, the measure should be used in preference to calculating such a measure from other metadata.

A cell measure construct must contain:

A measure property, which indicates the metric of the domain it supplies (see <reference to properties>).

A units property, consistent with the measure property (see <reference to properties>).

A typed numeric array of metric values:

the array shape is determined by the relevant subset of the domain axes in the order listed.

A cell measure construct may contain further properties (see <reference to properties>).

CF NetCDF

In CF-netCDF files, cell measure constructs correspond to variables named by the cell_measures attribute of the data variable.